344
FNCA52 TJSJ 261930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST WED AUG 26 2026
DISCUSSION
FIRE WEATHER CONDITIONS BECAME MORE FAVORABLE FOR RAPID FIRE
SPREAD LATE THIS MORNING, PROMPTING THE ISSUANCE OF A FIRE DANGER
STATEMENT (RFD) THROUGH 5 PM AST FOR PORTIONS OF PUERTO RICO AND
THE U.S. VIRGIN ISLANDS. LOW RELATIVE HUMIDITY VALUES, SUSTAINED
EASTERLY WINDS BETWEEN 10 AND 15 MPH WITH HIGHER GUSTS, AND DRY
FUELS WILL CONTINUE TO SUPPORT ELEVATED FIRE WEATHER CONDITIONS
THROUGH THIS AFTERNOON. THE GREATEST CONCERN REMAINS ACROSS
SOUTHERN AND SOUTHWESTERN PUERTO RICO, WHERE FUELS REMAIN
EXCEPTIONALLY DRY. INCREASING MOISTURE LATER TODAY AND TONIGHT
SHOULD PROMOTE BETTER HUMIDITY RECOVERY AND GRADUALLY REDUCE THE
FIRE WEATHER THREAT.
PRZ014-270800-
SOUTHEAST COASTAL PLAINS-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 20 20 20 0
TEMP (24H TREND) 77 (-2) 94 (+1) 76 94
RH % (24H TREND) 84 (0) 42 (-6) 84 39
WIND 20FT/EARLY(MPH) NE 14 E 16 E 14 E 18
WIND 20FT/LATE(MPH) NE 10 E 19 E 11 E 18
MIXING HGT(FT-AGL/MSL) 5480 5310
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 71240 90270
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-270800-
SOUTHERN HILLS-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 20 10
TEMP (24H TREND) 72 (-4) 91 (+2) 72 91
RH % (24H TREND) 94 (+3) 54 (-4) 93 53
WIND 20FT/EARLY(MPH) NE 13 E 12 E 11 E 13
WIND 20FT/LATE(MPH) NE 12 E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL) 6080 5950
TRANSPORT WND (MPH) E 14 E 18
VENT RATE (KT-FT) 72960 95200
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-270800-
NORTH COASTAL PLAINS-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 30 10
TEMP (24H TREND) 76 (-2) 92 (0) 75 92
RH % (24H TREND) 94 (+1) 58 (-6) 93 58
WIND 20FT/EARLY(MPH) E 17 E 13 E 17 E 14
WIND 20FT/LATE(MPH) E 13 E 18 E 13 E 20
MIXING HGT(FT-AGL/MSL) 5080 5770
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 66040 98090
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-270800-
NORTHERN HILLS-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 30 20
TEMP (24H TREND) 74 (-1) 90 (0) 73 91
RH % (24H TREND) 96 (0) 62 (-2) 94 60
WIND 20FT/EARLY(MPH) E 14 E 12 E 14 E 13
WIND 20FT/LATE(MPH) E 12 NE 16 E 11 E 18
MIXING HGT(FT-AGL/MSL) 5740 6960
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 63140 90480
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-270800-
WEST COAST-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 70 40 20
TEMP (24H TREND) 74 (-2) 94 (+1) 73 94
RH % (24H TREND) 95 (0) 59 (-4) 95 57
WIND 20FT/EARLY(MPH) E 18 E 11 E 13 E 14
WIND 20FT/LATE(MPH) E 16 E 12 E 13 E 14
MIXING HGT(FT-AGL/MSL) 5240 5090
TRANSPORT WND (MPH) E 8 E 13
VENT RATE (KT-FT) 36680 55990
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-270800-
EASTERN INTERIOR-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 30 0
TEMP (24H TREND) 74 (-3) 92 (+2) 74 92
RH % (24H TREND) 95 (+3) 55 (-4) 93 56
WIND 20FT/EARLY(MPH) E 13 E 11 E 12 E 14
WIND 20FT/LATE(MPH) E 12 E 12 E 12 E 14
MIXING HGT(FT-AGL/MSL) 6650 6340
TRANSPORT WND (MPH) E 14 E 20
VENT RATE (KT-FT) 79800 107780
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-270800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40 10
TEMP (24H TREND) 71 (-4) 87 (+3) 71 87
RH % (24H TREND) 98 (+3) 62 (-7) 98 62
WIND 20FT/EARLY(MPH) E 10 E 10 E 10 E 13
WIND 20FT/LATE(MPH) E 10 E 11 E 10 E 13
MIXING HGT(FT-AGL/MSL) 4950 4910
TRANSPORT WND (MPH) E 14 E 22
VENT RATE (KT-FT) 59400 93290
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-270800-
CENTRAL MOUNTAIN RANGE-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 70 30 20
TEMP (24H TREND) 70 (-3) 89 (+3) 69 89
RH % (24H TREND) 97 (+1) 63 (-3) 96 61
WIND 20FT/EARLY(MPH) NE 14 E 9 E 11 E 11
WIND 20FT/LATE(MPH) E 11 E 10 E 9 E 11
MIXING HGT(FT-AGL/MSL) 6700 7570
TRANSPORT WND (MPH) E 12 E 10
VENT RATE (KT-FT) 67000 68130
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-270800-
CAYEY MOUNTAIN RANGE-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY CLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 40 40 30 0
TEMP (24H TREND) 72 (-3) 88 (+1) 71 88
RH % (24H TREND) 98 (+2) 59 (-2) 96 59
WIND 20FT/EARLY(MPH) NE 11 E 11 E 10 E 12
WIND 20FT/LATE(MPH) NE 9 E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL) 5780 5400
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 75140 97200
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-270800-
VIEQUES-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY CLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 40 30 20 0
TEMP (24H TREND) 80 (-2) 91 (+1) 80 91
RH % (24H TREND) 82 (+1) 56 (-4) 80 56
WIND 20FT/EARLY(MPH) NE 17 E 14 E 16 E 17
WIND 20FT/LATE(MPH) E 16 E 13 E 16 E 16
MIXING HGT(FT-AGL/MSL) 3430 3500
TRANSPORT WND (MPH) E 16 E 22
VENT RATE (KT-FT) 48020 66500
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-270800-
CULEBRA-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 20 10
TEMP (24H TREND) 80 (-2) 91 (+1) 80 92
RH % (24H TREND) 87 (+3) 58 (-8) 84 57
WIND 20FT/EARLY(MPH) E 16 E 14 E 14 E 17
WIND 20FT/LATE(MPH) E 16 E 12 E 16 E 16
MIXING HGT(FT-AGL/MSL) 3370 3410
TRANSPORT WND (MPH) E 15 E 22
VENT RATE (KT-FT) 43810 64790
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-270800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 20 40 30 0
TEMP (24H TREND) 76 (-2) 94 (+1) 75 94
RH % (24H TREND) 87 (-1) 47 (-5) 86 42
WIND 20FT/EARLY(MPH) E 13 E 16 E 12 E 20
WIND 20FT/LATE(MPH) E 13 E 17 E 11 E 20
MIXING HGT(FT-AGL/MSL) 5630 5360
TRANSPORT WND (MPH) E 13 E 21
VENT RATE (KT-FT) 61930 96480
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-270800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20 0
TEMP (24H TREND) 79 (-2) 89 (+1) 79 90
RH % (24H TREND) 88 (+4) 58 (-8) 85 58
WIND 20FT/EARLY(MPH) NE 17 E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 16 E 12 E 16 E 16
MIXING HGT(FT-AGL/MSL) 3300 3200
TRANSPORT WND (MPH) E 15 E 22
VENT RATE (KT-FT) 42900 60800
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-270800-
ST CROIX-
330 PM AST WED AUG 26 2026
TONIGHT THU THU NIGHT FRI
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 40 40 30 0
TEMP (24H TREND) 79 (-2) 91 (+2) 79 91
RH % (24H TREND) 86 (+2) 60 (-7) 84 60
WIND 20FT/EARLY(MPH) NE 16 E 14 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 13 E 17 E 14
MIXING HGT(FT-AGL/MSL) 4700 4320
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 70500 73440
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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